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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (SBA Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Unguaranteed Portion of Sold SBA loans Retained	$ 23,898	$ 30,071
Other SBA Loans	22,024	22,254
Small Business Administration Loans	$ 45,922	$ 52,325

X

- Definition

Other SBA Loans, including, but not limited to SBA Express Loans and partially funding 7(a) program loans.

+ References

No definition available.

+ Details

Name:	fbiz_OtherSBALoans
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Small Business Administration Loans on the balance sheet.

+ References

No definition available.

+ Details

Name:	fbiz_SmallBusinessAdministrationLoans
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Unguaranteed Portion of Sold SBA loans Retained on the balance sheet.

+ References

No definition available.

+ Details

Name:	fbiz_UnguaranteedPortionofSoldSBAloansRetained
Namespace Prefix:	fbiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration